Spiritually speaking, you will be led to the edge of your own inadequate private resources.

At that point, you will stumble over a NECESSARY stumbling stone. You will "lose" something. We must be out of the driver's seat for a while or we will never learn how to give up control to the Real Guide. Until we are led to our limits in Life, we will not search or find the Real Source, the deep well, the constantly flowing stream of Spiritual Life.

The big thing that suffering does is that it takes you outside of precisely that logic that the Happiness Mentality encourages.

[Excuse me, I have to stop. This line of reasoning gets painful. Sorry. It's on my mind to get to the end.]